Zobrazeno 1 - 10
of 56
pro vyhledávání: '"Douglas Adolf"'
Publikováno v:
International Journal of Adhesion and Adhesives. 63:14-25
The degradation in the strength of napkin-ring (NR) joints bonded with an epoxy thermoset is evaluated in a humid environment. While adherend composition (stainless steel and aluminum) and surface preparation (polished, grit blasted, primed, coupling
Autor:
Rekha Ranjana Rao, Lisa Ann Mondy, David R. Noble, Patrick K. Notz, Douglas Adolf, Harry K. Moffat
Publikováno v:
International Journal for Numerical Methods in Fluids. 68:1362-1392
SUMMARY We have developed a production-level foam processing computational model suitable for predicting the self-expansion of foam in complex geometries. The model is based on a finite element representation of the equations of motion, with the move
Publikováno v:
The Journal of Adhesion. 86:1111-1131
Napkin ring adhesion tests over a broad range of experimental conditions suggested a de-bonding mechanism for glassy thermosets associated with “run-away” nonlinear viscoelasticity. Finite element analyses of these tests using a high fidelity, no
Publikováno v:
Journal of Applied Polymer Science. 119:2143-2152
Modeling of stresses in epoxies used as adhesives, coatings, or encapsulants in electronic packaging can guide an engineer to more robust designs and material selections. However, stresses by themselves allow evaluation of qualitative trends only. Qu
Autor:
Douglas Adolf, Robert S. Chambers, Daniel C. Hammerand, Ming-Ya Tang, Ihor Skrypnyk, Jim Gillick, Kevin Westgate
Publikováno v:
Polymer. 51:1530-1539
The Simplified Potential Energy Clock Model has been previously shown to predict accurately glassy polymer responses such as yield, creep, enthalpy relaxation, and physical aging. It was now used to predict the behavior of monofilament Nylon fiber. E
Publikováno v:
Polymer. 50:4257-4269
The potential energy clock (PEC) model for glassy polymers derived previously was shown to predict accurately a broad range of responses including temperature-dependent yield in different modes of deformation, enthalpy relaxation, volume recovery, an
Publikováno v:
Journal of Rheology. 51:517-540
A recent, nonlinear viscoelastic theory for predicting the thermomechanical response of glassy polymers has been shown to predict behaviors from enthalpy relaxation to temperature-dependent mechanical yield in various modes of deformation quite well.
Publikováno v:
The Journal of Adhesion. 83:85-104
Test geometries with well-defined stresses at the initiation of adhesive failure (failure in adhesion) were used to examine debonding of epoxies in controlled ramp and creep tests. Little effect of substrate, curative, or filler content was seen in f
Publikováno v:
The Journal of Adhesion. 82:63-92
Determining the initiation of adhesive failure at a surface buried deep within the bulk of an epoxy is qualitatively different from measuring the propagation of an existing surface crack. Most current tests are shown to be unsuitable for assessing th
Autor:
Douglas Adolf, Robert S. Chambers
Publikováno v:
Journal of Polymer Science Part B: Polymer Physics. 43:3135-3150
In previous studies, a nonlinear viscoelastic formalism for unfilled glassy polymers was developed, which employed a potential energy material clock. Awide variety of responses ranging from temperature-dependent mechanical yield to enthalpy relaxatio